hi kev,
i am far from an expert. we used to catch heaps of them in the canals.
get a bit of a berly trail going to attract them, bread for bait on small hook. we use a pencil float, wait for a "down" and you should be in business. have tried without a float and don't seen to catch any fish. my guess it they are very shy
failing that, burley a heap up and use your cast net
cheers
dazza